Relationship between test frequency and glass transition temperature was studied for four TATB-based PBXs and their binders (fluoropolymers) ,by using dynamic mechanical analysis (DMA) method. Results showed that of the four fluoropolymers,F₂₃₁₄,F₂₃₁₁, ,F₂₄₆₃ and F₂₆₀₃ ,only F₂₃₁₄ has an ap-parent secondary transition,which is ascribed to the fact that there are much more C-Cl bonds attached to a F₂₃₁₄ molecule. Meantime,the activation energies of the PBXs and their binders were calculated from the relationship between test frequency and glass transitiontemperature for the PBXs and their binders. It followed from comparisons between the activation energies of the PBXs and their binders that present of high contented TATB particles in the PBX may cause an obvious limitation in conformational movement of polymeric segment. A simple model,which had been confirmed by SEM photos of some PBXs, was pres-ented to explain this phenomenon.